<html>
    <head>
        <title>Polyfill demo - Cloudflare hosted with pinned version (with integrity checking for a *very limited* browser set - just an example!)</title>
        <script src="https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js?version=4.8.0" integrity="sha384-i0IGVuZBkKZqwXTD4CH4kcksIbFx7WKFMdxN8zUhLFHpLdELF0ym0jxa6UvLhW8/ sha384-3d4jRKquKl90C9aFG+eH4lPJmtbPHgACWHrp+VomFOxF8lzx2jxqeYkhpRg18UWC" crossorigin="anonymous"></script>
    </head>
    <body>
        ...
    </body>
</html>